Exd 34:29-35
And it came to pass, when Moses came down from mount Sinai with the two tables of testimony in Moses' hand, when he came down from the mount, that Moses wist not that the skin of his face shone while he talked with him. And when Aaron and all the children of Israel saw Moses, behold, the skin of his face shone; and they were afraid to come nigh him. And Moses called unto them; and Aaron and all the rulers of the congregation returned unto him: and Moses talked with them. And afterward all the children of Israel came nigh: and he gave them in commandment all that the LORD had spoken with him in mount Sinai. And [till] Moses had done speaking with them, he put a vail on his face. But when Moses went in before the LORD to speak with him, he took the vail off, until he came out. And he came out, and spake unto the children of Israel [that] which he was commanded. And the children of Israel saw the face of Moses, that the skin of Moses' face shone: and Moses put the vail upon his face again, until he went in to speak with him.
Moses' face was shining from a reflection of the glory of the Lord. a reflection of the Lord's glory that came from seeing his back parts as the Lord passed by him. from this did his face shine with the glory of the Lord. so much so that he had to cover his face for the fear of the people. fear of seeing the reflection of the hind parts of God. oh the fear that will come in that day when they must appear before him to answer for their rejection of Him. even the seraphims cover their face with wings given them. the mighty angelic seraphim can not look into the face of God for the Glory that is to much to behold.
ISA 6:1-3 In the year that king Uzziah died I saw also the Lord sitting upon a throne, high and lifted up, and his train filled the temple. Above it stood the seraphims: each one had six wings; with twain he covered his face, and with twain he covered his feet, and with twain he did fly. And one cried unto another, and said, Holy, holy, holy, [is] the LORD of hosts: the whole earth [is] full of his glory.
But to the child of God a higher promise is given,
1Jo 3:2, Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.
We shall see him as he is, what an amazing promise, what a thought, what an honor!